As stated by the White house spokesman Josh Ernest, the reason for this was a test of Pyongyang's ballistic missiles and nuclear bombs.
Restrictions imposed against 17 representatives of government and organizations of North Korea, as well as banks and trading vessels of the country. In particular, U.S. property blocked the DPRK.
In this regard, Ernest said: These actions are consistent with our long-standing commitment to applying constant pressure on the North Korean regime, the U.S. and the world community will not tolerate criminal acts North Korea related to nuclear tests and ballistic missiles. We will continue to impose sanctions against North Korea until it begins to meet its international obligations". (Quoted by TASS.)
On the eve of North Korea to hard labour for a long term sentenced students from the U.S. who tried to steal from a hotel room a propaganda poster.
The situation on the Korean Peninsula sharply intensified in the beginning of the year, when North Korea conducted its fourth nuclear weapon test. The government announced the explosion of a hydrogen bomb. Such a move, Pyongyang provoked strong criticism from the international community, but North Korean leader Kim Jong-UN continues to insist that it was all measures of self-defense against American aggression.
After about a month, North Korea launched the rocket with the satellite "kvanmenson-4" ("Shining star — 4"). The West concluded that there was no scientific benefit to this launch could not bring due to the low weight of the satellite, but to be a test of a ballistic missile — it is.
2 March the UN security Council adopted a resolution tightening sanctions against the DPRK. The document envisaged a ban on the export of Pyongyang coal, iron ore, titanium, vanadium, gold and other valuable metals, as well as embargo on the DPRK aviation and rocket fuel. In addition, sanctions were imposed in respect of the banking sector, mandatory inspection of cargo and targeted measures against persons and entities associated with nuclear and missile programs. A little later example of the Security Council was followed by South Korea, which has compiled a list of the persons and entities allegedly associated with the development of weapons of mass destruction. The measures included a ban on financial transactions involving Korean banks and freezing of accounts.